21798010717512 has 64 divisors (see below), whose sum is σ = 55406365104960. Its totient is φ = 7144569120000.

The previous prime is 21798010717423. The next prime is 21798010717513. The reversal of 21798010717512 is 21571701089712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21798010717513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2098762 + ... + 6928262.

It is an arithmetic number, because the mean of its divisors is an integer number (865724454765).

Almost surely, 2^{21798010717512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21798010717512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27703182552480).

21798010717512 is an abundant number, since it is smaller than the sum of its proper divisors (33608354387448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21798010717512 is a wasteful number, since it uses less digits than its factorization.

21798010717512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832654 (or 4832650 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 51.

The spelling of 21798010717512 in words is "twenty-one trillion, seven hundred ninety-eight billion, ten million, seven hundred seventeen thousand, five hundred twelve".